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Sugarbeet (Beta vulgaris) Response to and Sorption Characteristics of Nicosulfuron and Primisulfuron

Published online by Cambridge University Press:  12 June 2017

Karen M. Novosel
Affiliation:
Crop and Soil Sciences, Michigan State Univ., E. Lansing, MI 48824
Karen A. Renner
Affiliation:
Crop and Soil Sciences, Michigan State Univ., E. Lansing, MI 48824
James J. Kells
Affiliation:
Crop and Soil Sciences, Michigan State Univ., E. Lansing, MI 48824
Andrew J. Chomas
Affiliation:
Crop and Soil Sciences, Michigan State Univ., E. Lansing, MI 48824

Abstract

Nicosulfuron and primisulfuron are sulfonylurea herbicides that may persist in the soil and injure sensitive rotational crops such as sugarbeet. Studies were initiated to measure sugarbeet response one and two years after application of 70 and 140 g/ha of nicosulfuron and 40 and 80 g/ha of primisulfuron to corn. Nicosulfuron did not injure sugarbeet one or two years after application. In contrast, sugarbeet yield was reduced one year after application of 40 and 80 g/ha of primisulfuron. Injury was visible two years after application of 80 g/ha primisulfuron but this did not cause a yield reduction. In greenhouse studies, the concentration of nicosulfuron and primisulfuron that reduced sugarbeet growth by 50% were determined for six soils. Primisulfuron reduced sugarbeet growth more than nicosulfuron on four of six soils indicating greater potential for sugarbeet injury from primisulfuron. Sugarbeet response was highly correlated with soil organic matter content (R2 = 0.88). The sorption coefficients, Kd values, for nicosulfuron were 0.30 to 2.58 and the Kd values for primisulfuron were 0.76 to 3.47. Primisulfuron Kd values were higher than those of nicosulfuron on four of five soils indicating stronger affinity of primisulfuron for soil sorptive sites. The Kd values for both herbicides indicate low overall sorption. The greater sugarbeet injury observed in the field from primisulfuron is not due to greater availability of primisulfuron compared to nicosulfuron.

Type
Research
Copyright
Copyright © 1995 by the Weed Science Society of America 

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